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OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk

Hirao, Yuki; Bennett, David P.; Ryu, Yoon-Hyun; Koshimoto, Naoki; Udalski, Andrzej; Yee, Jennifer C.; Sumi, Takahiro; Bond, Ian A.; Shvartzvald, Yossi; Abe, Fumio; Barry, Richard K.; Bhattacharya, Aparna; Donachie, Martin; Fukui, Akihiko; Itow, Yoshitaka; Kondo, Iona; Cheung Alex Li, Man; Matsubara, Yutaka; Matsuo, Taro; Miyazaki, Shota; Muraki, Yasushi; Nagakane, Masayuki; Ranc, Clement; Rattenbury, Nicholas J.; Suematsu, Haruno; Shibai, Hiroshi; Suzuki, Daisuke; Tristram, Paul J.; Yonehara, Atsunori; Skowron, J.; Poleski, R.; Mroz, P.; Szymanski, M.K.; Soszynski, I.; Kozlowski, S.; Pietrukowicz, P.; Ulaczyk, K.; Rybicki, K.; Iwanek, P.; Albrow, Michael D.; Chung, Sun-Ju; Gould, Andrew; Han, Cheongho; Hwang, Kyu-Ha; Kil Jung, Youn; Shin, In-Gu; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.; Beichman, Charles A.; Bryden, Geoffery; Calchi Novati, Sebastiano; Carey, Sean; Scot...

OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk Thumbnail


Authors

Yuki Hirao

David P. Bennett

Yoon-Hyun Ryu

Naoki Koshimoto

Andrzej Udalski

Jennifer C. Yee

Takahiro Sumi

Ian A. Bond

Yossi Shvartzvald

Fumio Abe

Richard K. Barry

Aparna Bhattacharya

Martin Donachie

Akihiko Fukui

Yoshitaka Itow

Iona Kondo

Man Cheung Alex Li

Yutaka Matsubara

Taro Matsuo

Shota Miyazaki

Yasushi Muraki

Masayuki Nagakane

Clement Ranc

Nicholas J. Rattenbury

Haruno Suematsu

Hiroshi Shibai

Daisuke Suzuki

Paul J. Tristram

Atsunori Yonehara

J. Skowron

R. Poleski

P. Mroz

M.K. Szymanski

I. Soszynski

S. Kozlowski

P. Pietrukowicz

K. Ulaczyk

K. Rybicki

P. Iwanek

Michael D. Albrow

Sun-Ju Chung

Andrew Gould

Cheongho Han

Kyu-Ha Hwang

Youn Kil Jung

In-Gu Shin

Weicheng Zang

Sang-Mok Cha

Dong-Jin Kim

Hyoun-Woo Kim

Seung-Lee Kim

Chung-Uk Lee

Dong-Joo Lee

Yongseok Lee

Byeong-Gon Park

Richard W. Pogge

Charles A. Beichman

Geoffery Bryden

Sebastiano Calchi Novati

Sean Carey

B. Scott Gaudi

Calen B. Henderson

Wei Zhu

Etienne Bachelet

Greg Bolt

Grant Christie

Markus Hundertmark

Tim Natusch

Dan Maoz

Jennie McCormick

Rachel A. Street

Thiam-Guan Tan

Yiannis Tsapras

U.G. Jorgensen

M. Dominik

V. Bozza

J. Skottfelt

C. Snodgrass

S. Ciceri

R. Figuera Jaimes

D.F. Evans

N. Peixinho

T.C. Hinse

M.J. Burgdorf

S. Rahvar

S. Sajadian

M. Rabus

C. von Essen

Y.I. Fujii

J. Campbell-White

S. Lowry

C. Helling

L. Mancini

L. Haikala

Ryo Kandori



Abstract

We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the Spitzer satellite in a solar orbit. At high magnification, the anomaly in the light curve was densely observed by ground-based-survey and follow-up groups, and it was found to be explained by a planetary lens with a planet/host mass ratio of $q=7.0\times {10}^{-4}$ from the light-curve modeling. The ground-only and Spitzer-"only" data each provide very strong one-dimensional (1D) constraints on the 2D microlens parallax vector ${{\boldsymbol{\pi }}}_{{\rm{E}}}$. When combined, these yield a precise measurement of ${{\boldsymbol{\pi }}}_{{\rm{E}}}$ and of the masses of the host ${M}_{\mathrm{host}}=0.56\pm 0.07\,{M}_{\odot }$ and planet M planet = 0.41 ± 0.05 M Jup. The system lies at a distance D L = 5.2 ± 0.5 kpc from the Sun toward the Galactic bulge, and the host is more likely to be a disk population star according to the kinematics of the lens. The projected separation of the planet from the host is ${a}_{\perp }=3.5\pm 0.3\,\mathrm{au}$ (i.e., just over twice the snow line). The Galactic-disk kinematics are established in part from a precise measurement of the source proper motion based on OGLE-IV data. By contrast, the Gaia proper-motion measurement of the source suffers from a catastrophic 10s error.

Journal Article Type Article
Acceptance Date Jun 6, 2020
Online Publication Date Jul 23, 2020
Publication Date Aug 1, 2020
Publicly Available Date May 26, 2023
Journal Astronomical Journal
Print ISSN 0004-6256
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 160
Issue 2
Article Number 74
DOI https://doi.org/10.3847/1538-3881/ab9ac3
Keywords Gravitational microlensing, Gravitational microlensing, exoplanet detection
Publisher URL https://doi.org/10.3847/1538-3881/ab9ac3

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